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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e7fb5ad6c7cdf5383126da204186606cb0e4ec30916c31d7944cd3177c22b74' 
  AND token = 'm+5FLutm2guIJ7qN1bQld+PvetGRlymx+jf42PMfrHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}